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A weight W rests on a rough horizontal plane. If the angle of friction is θ, the least force that will move the body along the plane will be ___________

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A weight W rests on a rough horizontal plane. If the angle of friction is θ, the least force that will move the body along the plane will be ___________

(a) W cosθ

(b) W tanθ

(c) W cotθ

(d) W sinθ

The question was posed to me in an interview.

The question is from Laws of Nature in section Laws of Motion of Engineering Physics I

1 Answer

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Best answer
Right choice is (b) W tanθ

Explanation: The least force required to move weight W on a horizontal plane is equal to the force of friction, f=μR=μmg or f= W tanθ.

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